Oyster Pay-As-You-Go will reach Brockley, Ladywell, St John's, Crofton Park and other local stations as part of a city-wide roll-out on January 2nd, 2010, according to a Transport for London press release:

The Mayor of London, Boris Johnson, Transport Secretary, Andrew Adonis, and the Train Operating Companies serving the capital today confirmed that the hundreds of thousands of passengers who travel on National Rail services within Greater London will be able to use Oyster pay as you go from 2 January 2010.
The news means that South East Londoners will at last start to benefit from cheaper fares we have been promised for some time. The Standard illustrated how a Lewisham commuter would benefit, with a trip to Charing Cross costing £1.70 off-peak and £2.10 peak in January, compared with £2.40 at present.

The Evening Standard adds:

Under the agreement Oyster pay-as-you-go will be accepted on all Greater London services operated by Chiltern, National Express East Anglia, London Midland, First Great Western, First Capital Connect, Southern, Southeastern and South West Trains. Oyster pay-as-you-go will also be accepted on c2c services in Greater London as well as Grays, Chafford Hundred, Purfleet and Ockendon stations in Essex.
Thanks to everyone who alerted us to this story!

It's worth noting that there are implications for oyster season ticket holders when you go out of your zones via National Rail that your season ticket covers.

To quote the blog:'In a nutshell, from the 2nd of January, if you have a season ticket on your Oyster Card, you will need to charge it with an "Oyster Extension Permit" if you wish to make a journey via National Rail services that will take you outside your paid-for zones. In this context, "National Rail" effectively means "non-TfL" - so no OEP is required for travel on the Overground. These will only be available from Oyster resellers, which means that to travel outside of your zones from a not insignificant number of National Rail stations, you will need to have pre-charged your Oyster Card somewhere else with an OEP before you tap in and make your journey.'

The Oyster Extension Permit idea is clearly a naff one. It basically means you have to get pre-authorisation to travel outside the zones covered by your travelcard, if you're using National Rail services. This pre-authorisation WON'T be available at many stations - certainly not at Crofton Park or Ladywell anyway.

What it basically means is that if you have a zone 1 and 2 travelcard and decide to travel from Brockley to Forest Hill (zone 3) you'll be able to use prepay on the new Overground trains but, in theory, you'llhave to get pre-authorisation to make the same journey on one of Southern's trains.

It has already been possible to get a third off fares to and from central London from Brockley, you just have to get a National Railcard. It gives you approx a third off all rail travel nationally, including trips from Brockley to London Bridge/Charing X etc. Admittedly the railcard costs £30....

I guess this is an interim map that will have the "ELL" (or London Overground) in its next revision - one more "not in service" line would've made the illustration rather more busy than it needs to be.

You might wish to read Darryl's analysis of the changes as a balance to the piece in the Standard. He has done a proper anorak-style analysis (no offence D!) and revealed winners, losers and stealth fare rises. http://853blog.wordpress.com/2009/11/24/oyster-payg-arrives-with-londons-great-train-robbery/

Have noticed an influx of ticket inspectors recently - to catch people not getting an extension permit? On the train the other day, witnessed a man travelling from Victoria to Brockley (or so he said) getting stung for a fine because he had a one and two travel card but was inspected around Forest Hill which was in zone three. This got me thinking: what on earth would be the point of him getting an entension when in fact he was not going to get off until he was back in zone two again? How would that work? The whole thing seems incoherant. Or am I missing something?

The issue with travelling from Victoria to Brockley indeed makes no sense. I make that journey fairly regularly myself (though to New Cross Gate) and didn't realise until I read this that there was any issue with doing it on a one and two travelcard. Does this really mean I'm supposed to load a redundent extension onto it? Agree with anonymous that this is bizzare. What are other people's experiences? There must be many people on here who do this journey...